I just got the green fire minutes ago and i have to say i loved every moment of it.
The difficulty of the fight is what made it incredibly enjoyable, even before defeating him i was going to post a thank you thread just didnt get around to it. Nice to have something in the game that wasnt given and was actually a challenge.
To those that are calling for nerfs, i dont blame you the fight can be incredibly frustrating at times but trust me thats what makes the achievement great. Dont lose hope, just look at the toon i did it with, i just turned 90 a a couple days ago, if you set smalls goals and learn from every death you will be able to get your green fire too!